Joakim Noah was asked to change his clothes to be in accordance with the NBA's bench dress coach on Monday. (AP Photo)

Noah was dressed in a gray sweater, white T-shirt, black blazer and jeans before being asked by NBA personnel to change.

After the Bulls' 111-101 loss to the Pacers, Noah said wasn't quite sure what was unacceptable, per the league's bench dress code, about what he was wearing.

"I don't even know really," Noah said, according to the website. "They told me I wasn't dressed appropriately, so I changed."

During the game Noah was taking taunts from fans in stride including one fan who barked out, "Hey Noah, nice skinny jeans!" Noah responded by giving the fan a thumbs up.

Noah admitted that it was the first time in a while that he had dressed in that type of relatively casual outfit he wore.

"That's not really my style," he said. "But I want to be out there with my guys."

According to ESPN Chicago, Noah returned to the bench at the start of the second half wearing a blue-striped shirt. He also switched out of his black suit blazer and borrowed Randy Brown's blue blazer.

Apparently the sweater he wore under the blazer in the first half was the problem under the league’s fashion code of conduct, instituted in 2005 for inactive players sitting on the bench. Jeans are allowed, but only if they're deemed to be high-end denim.